Finding the Fourth Proportional to 9,100.72, 12,556.48 and 5,121.60

Step by Step Solution

1. Step 1: Write the proportion equation
   9,100.72 : 12,556.48 = 5,121.60 : x
2. Step 2: Convert to fraction form
   9,100.72/12,556.48 = 5,121.60/x
3. Step 3: Cross multiply
   9,100.72x = 12,556.48 × 5,121.60
4. Step 4: Simplify right side
   9,100.72x = 64,309,267.97
5. Step 5: Solve for x
   x = 64,309,267.97/9,100.72
6. Step 6: Final answer
   x = 7,066.39